402085509 has 16 divisors (see below), whose sum is σ = 614057088. Its totient is φ = 229254912.

The previous prime is 402085501. The next prime is 402085511. The reversal of 402085509 is 905580204.

It is not a de Polignac number, because 402085509 - 2³ = 402085501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402085509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402085501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11352 + ... + 30545.

It is an arithmetic number, because the mean of its divisors is an integer number (38378568).

Almost surely, 2^402085509 is an apocalyptic number.

It is an amenable number.

402085509 is a deficient number, since it is larger than the sum of its proper divisors (211971579).

402085509 is a wasteful number, since it uses less digits than its factorization.

402085509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42364.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 402085509 is about 20052.0699430258. The cubic root of 402085509 is about 738.0845941910.

The spelling of 402085509 in words is "four hundred two million, eighty-five thousand, five hundred nine".